<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" id="i1" placeholder="姓名">
<input type="text" id="i2" placeholder="工资">
<input type="text" id="i3" placeholder="工作">
<input type="button" value="添加" onclick="f()">
<table border="1">
  <tr>
    <th>姓名</th>
    <th>工资</th>
    <th>工作</th>
  </tr>
</table>

<script>
  function f(){
    // let i1 = document.querySelector("#i1");
    // let i2 = document.querySelector("#i2");
    // let i3 = document.querySelector("#i3");
    let table = document.querySelector("table");

    let tr = document.createElement("tr");
    let td1 = document.createElement("td");
    let td2 = document.createElement("td");
    let td3 = document.createElement("td");
    td1.innerText = i1.value;
    td2.innerText = i2.value;
    td3.innerText = i3.value;
    tr.append( td1,td2,td3);
    table.append(tr);
  }


</script>

</body>
</html>